I have to say, I was amazed at how nice an atmosphere there was when I visited LinkedIn a couple of months back. I was expecting something a bit stuffy, considering their market and somewhat conservative approach to innovation, but the people in the hallways and lunch room seemed genuinely relaxed and happy. It especially struck me after visiting Facebook a few hours earlier and finding it somewhat grim. All very subjective of course, but it makes me think this is a bit of real fun, not a horrific corporate attempt at 'flair'.